IMHO the transients and harmonic content, are more interesting than the 60Hz frequency!
But if the 60Hz frequency with superb rejection of transients is the only goal: The 60Hz line clock chips of the 1970's used the LV transformer secondary, a single pole of RC low-pass filtering to get rid of spikes, and a Schmitt trigger. See e.g. MM5402N datasheet: http://electrosurplus.online.fr/data/MM5402N%20NATIONAL.pdf I believe there are some good tube circuits for extracting 60Hz from line frequency, in the MIT Radiation Lab series and follow on books. I think at least one example is in the phantastron section. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
